https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95146
Bug ID: 95146
Summary: gfortran -cpp – leading spaces before '#'
preprocessing directive not handled
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Found when looking at the build results for
meson (Python-based build system)
which fail like:
[ 384s] Command line: gfortran /home/abuild/rpmbuild/BUILD/meson-0.54.1/b
536484cc32/meson-private/tmpp6hst_hh/testfile.f90 -pipe -cpp -E -P
-D_FILE_OFFSET_BITS=64 -cpp -P -O0
[ 384s]
[ 384s] Code:
[ 385s]
[ 385s] #ifdef __has_include
[ 385s] #if !__has_include("omp.h")
[ 385s] #error "Header 'omp.h' could not be found"
[ 385s] #endif
[ 385s] #else
[ 385s] #include <omp.h>
[ 385s] #endif
...
[ 385s] Error: "__has_include" used outside of preprocessing directive
The problem is that the leading spaces before the '#' are not properly handled.
Simpler example ' #define A 5'. Without space, "gfortran -E" removes that line,
with space, the line remains after preprocessing.
