Re: [Tinycc-devel] POSIX compliance; spaces not supported with -l for libs

[Christian Jullien]

Hello John,

I like very much the idea to make tcc POSIX compliant. I still work on C/C++ 
normalization in AFNOR group and worked on different groups including ISLISP 
and POSIX, so standards matter for me :).

Please, also consider that neither gcc nor clang support space after -O:

$ clang -O 3 cspy.c -l m
clang: error: no such file or directory: '3'

$ clang -O 3 cspy.c -l m
clang: error: no such file or directory: '3'

I think that nobody will refuse a patch that fully supports POSIX compatible 
option as long it does not break gcc/cl compatibility.

libxnet and libtrace may be especially checked by configure (new --posix) 
option and dropped from command line if not supplied by the system. An 
alternate solution is to make almost empty libxnet.a and libtrace.a when 
--posix option is set by ./configure

Can you try to propose something?

C.


-----Original Message-----
From: Tinycc-devel [mailto:tinycc-devel-bounces+eligis=orange.fr@nongnu.org] On 
Behalf Of John Scott
Sent: Sunday, July 05, 2020 00:15
To: tinycc-devel@nongnu.org
Subject: [Tinycc-devel] POSIX compliance; spaces not supported with -l for libs

Hi,

I was checking if tcc conforms to the POSIX standard for a C99 compiler [1], 
particularly to make the case for implementing a generic POSIX C compiler 
backend in Meson [2]. In the meantime, tcc can't be used for building. There is 
concern that small compilers all have their own caveats, and tinycc's seem 
minor.

POSIX says a space after -l—and all flags for that matter—is okay, but tcc 
doesn't accept this:
$ tcc hello.c -l c
tcc: error: library '' not found

It also doesn't handle a space after -O. Fortunately -D, -I, -L, and -U all 
tolerate this.

For completeness here's another discrepancy:
* tcc errors with -lxnet or -ltrace, but so do gcc and Clang.

Please let me know if there's anything I can do to help, and thanks for working 
on tinycc!

[1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/c99.html
[2] https://github.com/mesonbuild/meson/issues/5406