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http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=720ac23ba60789335d294e051e2a2c48eef4e2b8
commit 720ac23ba60789335d294e051e2a2c48eef4e2b8
Merge: 2f05401 d90be20
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Mon Jun 23 10:00:15 2014 -0400
Commit: CMake Topic Stage <kwro...@kitware.com>
CommitDate: Mon Jun 23 10:00:15 2014 -0400
Merge topic 'gfortran-compressed-modules' into next
d90be200 Fortran: Add support for GNU >= 4.9 compressed modules (#14975)
http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=d90be200ecdfd35395f7fdd1f82ddcd4006a256e
commit d90be200ecdfd35395f7fdd1f82ddcd4006a256e
Author: Brad King <brad.k...@kitware.com>
AuthorDate: Thu Jun 19 09:11:29 2014 -0400
Commit: Brad King <brad.k...@kitware.com>
CommitDate: Mon Jun 23 10:00:27 2014 -0400
Fortran: Add support for GNU >= 4.9 compressed modules (#14975)
From the GCC 4.9 release notes for Fortran:
https://gcc.gnu.org/gcc-4.9/changes.html
"Module files: The version of the module files (.mod) has been
incremented; additionally, module files are now compressed."
Teach cmDependsFortran::ModulesDiffer to look for the gzip magic numbers
at the beginning of the module file. If found, assume the module was
produced by gfortran >= 4.9. The modules do not appear to contain the
date as earlier versions did so we can compare the content directly
and do not actually need to decompress.
diff --git a/Source/cmDependsFortran.cxx b/Source/cmDependsFortran.cxx
index d5472a1..e4a146c 100644
--- a/Source/cmDependsFortran.cxx
+++ b/Source/cmDependsFortran.cxx
@@ -765,7 +765,11 @@ bool cmDependsFortran::ModulesDiffer(const char* modFile,
const char* compilerId)
{
/*
- gnu:
+ gnu >= 4.9:
+ A mod file is an ascii file compressed with gzip.
+ Compiling twice produces identical modules.
+
+ gnu < 4.9:
A mod file is an ascii file.
<bar.mod>
FORTRAN module created from /path/to/foo.f90 on Sun Dec 30 22:47:58 2007
@@ -821,21 +825,30 @@ bool cmDependsFortran::ModulesDiffer(const char* modFile,
*/
if (strcmp(compilerId, "GNU") == 0 )
{
- const char seq[1] = {'\n'};
- const int seqlen = 1;
-
- if(!cmDependsFortranStreamContainsSequence(finModFile, seq, seqlen))
+ // GNU Fortran 4.9 and later compress .mod files with gzip
+ // but also do not include a date so we can fall through to
+ // compare them without skipping any prefix.
+ unsigned char hdr[2];
+ bool okay = finModFile.read(reinterpret_cast<char*>(hdr), 2)? true:false;
+ finModFile.seekg(0);
+ if(!(okay && hdr[0] == 0x1f && hdr[1] == 0x8b))
{
- // The module is of unexpected format. Assume it is different.
- std::cerr << compilerId << " fortran module " << modFile
- << " has unexpected format." << std::endl;
- return true;
- }
+ const char seq[1] = {'\n'};
+ const int seqlen = 1;
- if(!cmDependsFortranStreamContainsSequence(finStampFile, seq, seqlen))
- {
- // The stamp must differ if the sequence is not contained.
- return true;
+ if(!cmDependsFortranStreamContainsSequence(finModFile, seq, seqlen))
+ {
+ // The module is of unexpected format. Assume it is different.
+ std::cerr << compilerId << " fortran module " << modFile
+ << " has unexpected format." << std::endl;
+ return true;
+ }
+
+ if(!cmDependsFortranStreamContainsSequence(finStampFile, seq, seqlen))
+ {
+ // The stamp must differ if the sequence is not contained.
+ return true;
+ }
}
}
else if(strcmp(compilerId, "Intel") == 0)
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