https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101238
Bug ID: 101238
Summary: Driver won't find cc1/cc1plus on MinGW, CXXFLAGS need
-D__USE_MINGW_ACCESS
Product: gcc
Version: 10.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: tomas.kalibera at gmail dot com
Target Milestone: ---
Created attachment 51070
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51070&action=edit
Use -D__USE_MINGW_ACCESS when compiling the driver.
Summary: one needs to add CXXFLAGS+=-D__USE_MINGW_ACCESS to config/mh-mingw so
that the driver finds executables on Windows. This is already fixed in GCC 11,
but not in GCC 10.
More details: GCC 10 driver is compiled with g++ without-D__USE_MINGW_ACCESS on
MinGW. That option is only added to CFLAGS, but not CXXFLAGS. Consequently, the
driver will not find executables such as cc1, because access(,X_OK) will always
return an error on Windows, as access() on Windows does not check for
executability anymore. With __USE_MINGW_ACCESS, MinGW will use its own
implementation of access() which for X_OK behaves the same as R_OK.
I've tested the (trivial) attached patch and it resolved the issue on my system
as expected.
