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From: "raj.khem at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug driver/115368] New: Wrong order of gcc include paths on musl
 systems
Date: Thu, 06 Jun 2024 07:00:58 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: driver
X-Bugzilla-Version: 14.1.0
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X-Bugzilla-Who: raj.khem at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115368

            Bug ID: 115368
           Summary: Wrong order of gcc include paths on musl systems
           Product: gcc
           Version: 14.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: raj.khem at gmail dot com
  Target Milestone: ---

When doing cross-builds targeting musl based systems, gcc driver adds -ipre=
fix
to cc1/cc1plus call, the path is based on gcc cross compiler installation
location, and points to GCC private headers which override some of system
headers e.g. stddef.h stdint.h, stdarg.h to name a few. This works ok with
glibc based systems but musl does not depend/use gcc's private headers [1] =
and
-iprefix prepends to search path which means the headers from gcc installat=
ion
will be picked up first. This causes problems e.g. when configuring python
build, it tries to detect platform and logic to detect musl system is based=
 on
musl specific define coming from stdarg.h, however musl cross gcc feeds the
gcc's own stdarg.h header and the test fails.=20

[1] https://gitlab.alpinelinux.org/alpine/aports/-/issues/12477#note_145159=