gcc14 (MacPorts) cannot handle stdio.h include

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                          I am trying to compile (from source, I am aware that there is a port but I need to compile from source) a library (GKlib) with MacPorts gcc14 on Sonoma 14.7,3. MacPorts is up to date

I have set thing sup with

    git clone https://github.com/KarypisLab/GKlib.git 
    cd GKlib
    make config cc=gcc-mp-14 prefix=../GKlibInstall
    make

make results in:

    /opt/local/bin/gcc-mp-14  -I/Users/gerben/RenskeDev/Leon/fromsource/GKlib/. -I/Users/gerben/RenskeDev/Leon/fromsource/GKlib/test -DLINUX -D_FILE_OFFSET_BITS=64 -std=c99 -fno-strict-aliasing -march=native -fPIC -Werror -Wall -pedantic -Wno-unused-function -Wno-unused-but-set-variable -Wno-unused-variable -Wno-unknown-pragmas -Wno-unused-label -DNDEBUG -DNDEBUG2 -DHAVE_EXECINFO_H -DHAVE_GETLINE -O3 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk -mmacosx-version-min=14.7 -MD -MT CMakeFiles/GKlib.dir/b64.c.o -MF CMakeFiles/GKlib.dir/b64.c.o.d -o CMakeFiles/GKlib.dir/b64.c.o -c /Users/gerben/RenskeDev/Leon/fromsource/GKlib/b64.c
    In file included from /Users/gerben/RenskeDev/Leon/fromsource/GKlib/GKlib.h:32,
                     from /Users/gerben/RenskeDev/Leon/fromsource/GKlib/b64.c:20:
    /opt/local/lib/gcc14/gcc/x86_64-apple-darwin23/14.2.0/include-fixed/stdio.h:83:8: error: unknown type name 'FILE'
       83 | extern FILE *__stdinp;
          |        ^~~~

A test file (Hello World) in the directory above compiles fine. I’ve seen messages with this kind of trouble but I don’t understand exactly where this is going wrong. 

gcc14 has a 'translated/fixed' stdio.h from Apple (/opt/local/lib/gcc14/gcc/x86_64-apple-darwin23/14.2.0/include-fixed/stdio.h) that starts with:

    #ifndef _STDIO_H_
    #define _STDIO_H_
    
    #include 
    
    #include 
    
    __BEGIN_DECLS
    extern FILE *__stdinp;

When testing with the test file (a simple Hello World), the culprit seems to be

     -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.2.sdk

My guess is that I need to make sure make etc. add another -isysroot before the Apple SDK one. Is that correct (because then I have to find out how).

It’s been far too long I have been doing stuff like this, so I could use tips.

Thanks,
Asked by gctwnl (762 rep)
Feb 13, 2025, 10:34 AM
Last activity: Jul 15, 2025, 07:00 PM
gcc14 (MacPorts) cannot handle stdio.h include

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