[sr #110269] AC_PROG_LEX failing

[Paul Eggert]

Update of sr #110269 (project autoconf):

 Open/Closed:Open => Closed 


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[sr #110269] AC_PROG_LEX failing

[Paul Eggert]

Update of sr #110269 (project autoconf):

  Status:None => Done   

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Follow-up Comment #6:

Thanks for the bug report and detailed analysis. I looked into the commit that
you mentioned, and the problem seems to be that it introduced an AC_MSG_ERROR
which causes 'configure' to fail entirely, whereas what it should do is give
up on 'flex'. In your case you have a cross-build where 'flex' (on your build
platform) is available but the 'flex' library (on your host platform) is not,
and this causes the AC_MSG_ERROR to trigger.

For your particular case I expect it's better for 'configure' to behave as if
'flex' does not exist, so I installed the attached patch into Autoconf master
on Savannah. Please give it a try.

I am boldly marking this bug report as "done" but will change its status back
if the patch doesn't fix things for you.

(file #49491)
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Additional Item Attachment:

File name: 0001-Fix-AC_PROG_LEX-regression.patch Size:2 KB
   




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[sr #110269] AC_PROG_LEX failing

[Ross Burton]

Follow-up Comment #5, sr #110269 (project autoconf):

I can confirm that reverting that commit 'fixes' the issue, and all of the
projects that were failing in AC_PROG_LEX are now building fine.

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[sr #110269] AC_PROG_LEX failing

[Ross Burton]

Follow-up Comment #4, sr #110269 (project autoconf):

I can replicate this with a minimal configure.ac:

AC_INIT([argh], [1])
AC_PROG_LEX
AC_OUTPUT([])

Flex and its headers are present.

The config.log files are effectively identical until "checking lex library",
autoconf 2.69 reports none needed but 2.70b reports not found.

Looks like this was introduced by "Fix logic error in _AC_PROG_LEX_YYTEXT_DECL
(#109320)".

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[sr #110269] AC_PROG_LEX failing

[Ross Burton]

Follow-up Comment #3, sr #110269 (project autoconf):

Which suggests to me the problem can be isolated to _AC_PROG_LEX_YYTEXT_DECL.

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[sr #110269] AC_PROG_LEX failing

[Ross Burton]

Follow-up Comment #2, sr #110269 (project autoconf):

For reference, building with autoconf 2.69 produces this output:

checking for flex... flex
checking lex output file root... lex.yy
checking lex library... none needed

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[sr #110269] AC_PROG_LEX failing

[Ross Burton]

Follow-up Comment #1, sr #110269 (project autoconf):

gmp fails in the same way.

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[sr #110269] AC_PROG_LEX failing

[anonymous]

URL:
  

 Summary: AC_PROG_LEX failing
 Project: Autoconf
Submitted by: None
Submitted on: Wed 15 Jul 2020 04:04:43 PM UTC
Category: None
Priority: 5 - Normal
Severity: 3 - Normal
  Status: None
 Privacy: Public
 Assigned to: None
Originator Email: r...@burtonini.com
 Open/Closed: Open
 Discussion Lock: Any
Operating System: None

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Details:

Both Flex and gdbm use AC_PROG_LEX and fail the same way with autoconf
2.70beta but worked with 2.69.

| checking for flex... flex
| checking for lex output file root... lex.yy
| checking for lex library... not found
| configure: error: required lex library not found

The config.log shows it trying a few options:

configure:12442: checking for lex library
configure:12457: aarch64-poky-linux-gcc  -fstack-protector-strong 
-D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security
--sysroot=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot
-o conftest  -O2 -pipe -g -feliminate-unused-debug-types
-fmacro-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot=

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot-native=
  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-z,relro,-z,now conftest.c 
 >&5
/usr/src/debug/flex/2.6.4-r0/build/conftest.l:17: undefined reference to
`yywrap'


configure:12457: aarch64-poky-linux-gcc  -fstack-protector-strong 
-D_FORTIFY_SOURCE=2 -Wformat -Wformat-security
-Werror=format-security
--sysroot=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot
-
o conftest  -O2 -pipe -g -feliminate-unused-debug-types
-fmacro-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-
poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0 
-fdebug-prefix-map=/home/ross/Yocto/bui
ld/tmp/work/armv8a-poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0  
   -fdebug-prefix-map=/
home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot=
 -fdebug-prefix
-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot-native=
  -Wl,-O1 -Wl,--hash-s
tyle=gnu -Wl,--as-needed -Wl,-z,relro,-z,now conftest.c -lfl  >&5
/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/.
./../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/10.1.0/ld: cannot find
-lfl


configure:12457: aarch64-poky-linux-gcc  -fstack-protector-strong 
-D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security
--sysroot=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot
-o conftest  -O2 -pipe -g -feliminate-unused-debug-types
-fmacro-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0=/usr/src/debug/flex/2.6.4-r0

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot=

-fdebug-prefix-map=/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot-native=
  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-z,relro,-z,now conftest.c
-ll  >&5
/home/ross/Yocto/build/tmp/work/armv8a-poky-linux/flex/2.6.4-r0/recipe-sysroot-native/usr/bin/aarch64-poky-linux/../../libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/10.1.0/ld:
cannot find -ll




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