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This was already reported in Sébastien's answer to:

• Ask Sage question 50885

and made into:

• Sage Trac ticket 29966: integrate(sqrt(x + sqrt(x)), x, algorithm='giac') raises RuntimeError

This is already fixed this in Giac; future versions should no longer have this problem.

The place to report Giac issues in general is the Giac/Xcas forum.

This was already reported in Sébastien's answer to:It turns out @Sébastien hit that bug when comparing various integration engines to answer:

• Ask Sage question 5088550885: integrate sqrt(x+sqrt(x))

and made into:having checked it did not correspond to existing tickets, he opened one for that:

• Sage Trac ticket 29966: integrate(sqrt(x + sqrt(x)), x, algorithm='giac') raises RuntimeError

This Bernard Parisse, the main Giac developer, posted there that that problem is already fixed this in Giac; future versions should no longer have this problem.

The place to report Giac issues in general in Giac.

When Sage uses a Giac version with such warnings, silencing them would be nice, see comment 9 by @vdelecroix at Sage Trac ticket 29966. See previous Giac tickets

Regarding where to ask about Giac:

• as @tmonteil recalls, Giac bugs are worth tracking on the Sage side too when relevant
• the main Giac developer participates in relevant Sage discussions and Sage Trac tickets
• the main discussion venue for Giac itself is the Giac/Xcas forum.

• Giac bugs, feature requests and questions can be discussed there

Related:

• Sage Trac tickets with giac in the summary
• in a comment to Sage Trac ticket 31594, the main Giac developer mentions your integrals test suite

It turns out @Sébastien hit that bug when comparing various integration engines to answer:

• engines while answering Ask Sage question 50885: integrate sqrt(x+sqrt(x))

and having .

Having checked it did not correspond to existing tickets, he opened one for that:

• Sage Trac ticket 29966: integrate(sqrt(x + sqrt(x)), x, algorithm='giac') raises RuntimeError

Bernard Parisse, the main Giac developer, posted there that that problem is already fixed in Giac.

When Sage uses a Giac version with such warnings, silencing them would be nice, see comment 9 by @vdelecroix at Sage Trac ticket 29966. See previous Giac tickets29966.

Regarding where to ask about Giac:

• as @tmonteil recalls, Giac bugs are worth tracking on the Sage side too when relevant
• the main Giac developer participates in relevant Sage discussions and Sage Trac tickets
• the main discussion venue for Giac itself is the Giac/Xcas forum
• Giac bugs, feature requests and questions can be discussed there

Related:

• Sage Trac tickets with giac in the summary
• in a comment to Sage Trac ticket 31594, the main Giac developer mentions your integrals test suite